/Engine/Source/Runtime/Core/Public/Misc/Char.h
TCharSet of utility functions operating on a single character. The functions are specialized for ANSICHAR and TCHAR character types. You can use the typedefs FChar and FCharAnsi for convenience.
template<typename CharType> struct TChar : public [TCharBase< CharType, sizeof(CharType)>](API\Runtime\Core\Misc\TCharBase)